The answer would be A. Amber Galloway Gallego. She is an ASL interpreter. She mostly does concerts and music festivals.
Nyle DiMarco is just a deaf activist
Mandy Harvey has been deaf since the age of 18, but she is a singer and songwriter.
Hope this helps!
The next letter is T called tau
There is not a specific date to this but the first earth day was on april 22 1970
D! Indexing because is a noun